2. Box o' toys. time interval Fchild on b (newtons) 0 to 2 sec. 120 2...
A chimpanzee named Allison pushes a box. She loads the box full of her toys until it has a mass of 8 kg. The coefficient of kinetic friction between the box and the floor is mu k = 0.4. The box is initially in motion, and moving at a velocity of 1.2 m/s to the right. a) If Allison pushes horizontally to the right with a force of 60N, what is the acceleration of the box? Is the box speeding...
v = 2 m/s F = 100 N 3. (4 points) A child pushes a 20 kg box across a wood floor as shown in Figure 3. The force exerted by the child is 100 N and horizontal. If the box is moving with a constant speed, 2 m/s. (a). Find the magnitude and the direction of the kinetic friction force on the box (b). Determine the coefficient of kinetic friction between the box and the floor. (C). If the...
A box of mass 2 kg is pulled horizontally by a force that has magnitude of F= 10 N and slides across the floor in the positive x-direction , see figure below. If the coefficient of kinetic friction between the box and the surface is Uk= 0.25, what is the box's acceleration
A storeho use worker pushes a box with a refrigerator (mass:96.0-kg) at constant velocity for a distance of 11.0 m. He pushes in the direction parallel to the horizontal floor. A 250.0-N frictional force opposes the motion of the box. Use Newtons second law and definition of work to answer the questions below. (a) (1 point) What is the acceleration of the box? as (b) (2 points) What is the net force, acting on the box? Write down Newtons second...
A 30-kg box is at rest on a horizontal floor with friction coefficientsμs= 0.65 (static) and μk= 0.55 (kinetic). You push on the box HORIZONTALLY (parallel to the floor) with varying applied force. For each applied force below, find the magnitude of the friction force exerted by the floor on the box(in Newtons), and state whether the friction is static or kinetic. (a) Applied force 100 N. (b) Applied force 150 N. (c) Applied force 190 N. (d) Applied force...
Rick and Sarah are sliding a box of mass 10.0kg across a floor. The motion of the box is strictly horizontal, so we can ignore vertical forces – more on that later. Rick pushes with a force of 30.0N. Sarah pulls in the same direction with a force of 25.0N. Friction between the box and the floor is 50.0N. The speed of the box at one time was 1.50m/s. a) What is the speed of the box 2.00sec after that?...
3. A car speeds from 15 to 35 m/sec over a time interval of 4 seconds. Draw a motion diagram (including the acceleration). Fill in the information. xo-0 玢= Vs- Average speed of car Find the distance traveled for that time interval using a) dVave c) x(t) = ½ at 2 + Vot + Xo
1) Which term best describes an object's resistance to a change in motion A) Force B) Inertia C) Acceleration D) Resistance 2) Two skaters, Cathy and Mike, are standing on a frozen pond. Mike has twice the mass as Cathy. If Mike pushes to the left on Cathy, what can be said about the forces and accelerations on each person? A) Cathy experiences a force and acceleration to the left, while Mike experiences an equal force in the opposite direction....
2 (2.39). An object's velocity vs time function is vo)-(-7t+10)m/sec. a) Sketch the function between -0 and 1 6 b) What are the turning points? Explain why these are turning points. c) What is the object's acceleration at each of the turning points? d) Suppose the object's position is x- 18 m at r 3 sec. Write the object's position vs time function x()
1. A 200 kg crate is pushed across a floor by a force F = 250 newtons at an angle 0 = 53 below horizontal. The floor exerts a 50 newton frictional force on the crate opposing the motion. a. Draw a labeled free body diagram showing the forces acting on the trunk. (+2) b. Below, write Newtons's 2nd Law (F = må) in the horizontal (x) and vertical (v) direction, using the names of the forces from your free...